Entitled: "Mail orderlies" note "Philadelphia Navy Yard" on right mailbag; "U.S.S. Vesuvius" on cap of third man from right. The MPS is required to adhere to United States Postal Service (USPS) rules, federal laws, and various international laws and agreements for movement of military mail into more than 85 countries. The individual military services (Army, Marine Corps, Navy, Coast Guard, Air Force) are each, themselves, responsible for the costs, manpower, and facilities of mail that travels through their own department. This is why the military services maintains command and control over all military postal assets, both in the United States and abroad. Photographed by Detroit Publishing Company, 1890-1900.